I've heard larger Zus just once at a local hifi show.
THey were just OK for pop/rock music off a 6 watt SET amp, below par at that particular show. Sounded very nice on more smaller scale acoustic type music
Zu guy in the room admitted that they would have benefited from more power for pop/rock.
Klipsch can be a nice choice as well if in the right setup. Some tweaking with system, room, the whole kaboodle over time is pretty much always the key to get where you want once you make some basic decisions on what to build around. Kind of like building a dream house, but hopefully not nearly as expensive.